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C W DUNN Machine for Filing Saws.

No. 233,739. Q Patented Oct. 26, I880.

INVENTOR (Aha-De,

WITNESSES ATTORNEY CHARLES WV. DUNN, OF CLEVELAND, OHIO, ASSIGNOR TOHIMSELF AND WVILLIAM SAYLOR, OF SAME PLACE.

MACHINE FOR FILING SAWS.

SPECIFICATION forming part of Letters Patent No. 233,739, dated October26, 1880.

' Application filed January 5, 1880.

To all whom it may concern:

Be it known that I, CHARLES W. DUNN, of Cleveland, in the county ofOuyahoga and State of Ohio, have invented certain new and usefulImprovements in Machines for Filing Saws; and I do hereby declare thefollowing to be a full, clear, and exact description of the invention,such as will enable others skilled in the art to which it pertains tomake and use it, reference being had to the accompanying drawings, whichform part of this specification.

My invention relates to a machine for filing saws; and it consists inparts and combination of parts, as will more fully hereinafter appear.

In the drawings, Figure 1 is a view, in projection, of a deviceconstructed according to my invention. Fig.2 is a detached longitudinalvertical sectional view of a portion of my device, showing the mechanismby which the file-frame is kept and operated at any desired angle. Fig.3is a detached view of the toothmeasuring device. Fig. 4 is a plan viewof the machine.

In the said drawings, Arepresents the clamp between which the saw isheld during the operation of filing. This may be of any form or shapeadapted to receive and retain the saw B.

O 0 represent the frame or support of my device adapted to embrace theclamps A, and move longitudinally thereon.

D is a vertical shaft adapted to turn readily in the head or frame 0,and supporting and carrying the file-frame E.

F is a spring, adapted to bear upon the frame 0, and at its centerpermanently attached to the shaft D. WVhen free it supports the shaft D,and with it the file-frame E. When the file-frame is in use and weightis applied to the frame E, sufficient to operate the file upon the sawB, the spring F, at its center, is can ried down with the shaft D. WVhenthe operation ceases and the power is removed from the frame E thespring F, being released, returns to its position, as shown in Fig. 1,carrying with it the shaft D and file-frame E.

For regulating the depth of cut a thread is out upon the upper end ofthe shaft D, and a thumb-nut, G, adapted to engage with the thread,placed thereon. By means of this screw and its thumb-nut G the depth ofcut of the file can be regulated. When pressure is applied to the springF the thumb-nut G is depressed until it comes into contact with the dialH.

K is a lever pivoted at K to the frame 0, or to a second leverprojecting from and at tached to the frame 0, and provided at one endwith a set-screw, K and at the other end with a gage or measuringdevice, K and also at its lower extremity with a pin, K adapted toengage the clamp A. The object of this portion of my invention is toenable an unskilled operator to file all the teeth of a saw exactlyalike and make them of equal size.

The operation of my device is as follows: The ordinary saw-clamp A,clasping the saw to be filed, is placed in any suitable retainingdevice, as an ordinary vise. The machine is then placed upon the clamp.The pin K is pressed into the clamp A, thus affording a fulcrum for thelever K to swing upon from its lower end. By means of the gage ormeasure K Fig. 3, the width of a tooth or its throat can readily beascertained, as said gage lies closely adjacent to the saw. It will beseen that if the pin K is pressed into the stationary clamp A, and thenthe frame 0 drawn in a direction away from the lever K, the lower end ofsaid lever will be held stationary, and it will be pulled upon by theframe from its connection therewith at K. This will cause the lever K toswing upon its pin K until arrested at its upper end by the set-screw Kcoming into contact with the frame 0. Now, the set-screw K is soadjusted that when the frame 0 is moved from it a distance correspondingrelatively to the width of a tooth or its throat, it will be arrested byreason of the stationary engagement between the pin K and the clamp Aand the contact of the setscrew K with the frame 0. The parts must be sofixed and adjusted that the stopping or arrest of the frame will occurat a point where a file, E when it is brought down, will come into athroat to be operated upon. When ready to file the next throat or tooththe pin K is disengaged, and the lower end of the lever K moved towardthe frame 0 a proper distance (measured at K to correspond with thewidth of a tooth, and then again pressed down into the clamp A; and now,when the frame (J is drawn in a direction away from the lever K, it canonly move the distance determined by the adjustment of the set-screw Kand when said set-screw and frame 0 come into contact this frame will belocated at a point over the saw where the file should be pressed downagain to its work.

The depth of the cut of the tooth is regulated by adjusting thethumb-nut Gr upon the vertical shaft D. The angle or bevel upon which itis desired the saw shall be filed having been determined, the machine isset by causing the pointer H to be moved to the dc sired angle indicatedon the dial H. The frame is then held in position by fixing the setscrewJ. The machine being new adjusted for width of tooth, depth of tooth,and bevel, the operation of filing may be commenced. This is performedby pressing upon the spring F until the file E comes in contact with thesaw B, when the file-frame E is worked backward and forward by meansofthe handle E, the

pressure upon the spring F being continued until the thumb-nut Gr restsupon the dial H and the file ceases to cut. This operation is continueduntil all the teeth of the saw are filed, when it will be found thateach tooth is cut to the same size, depth, and bevel, an operation thatis impossible to accomplish by the eye and hand alone.

WVhat I claim is 1. In a saw-filing machine, the combination, with theframe 0, of the adjusting-lever K, provided with pin K and set-screw Ksaid adjusting-lever being connected with frame 0 by means of a link,substantially as set forth.

2. In a saw-filing machine, the combination, with the frame 0, of theadjusting-lever K, provided with pin K, set-screw K and pivoted gage Ksubstantially as set forth.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

CHARLES W. DUNN.

Witnesses JNo. ORoWELL, J12, VVILLARD FRAGKER.

